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- #include <iostream>
- #include <stdio.h>
- #include <string.h>
- using namespace std;
- char c[100][100];
- struct {int a;
- char b;}A[28];
- int p_sistem(int m,int p, int n)
- {
- int i,j,h,x;
- for(i=0;i<n;i++)
- {cin>>c[i];
- if(strlen(c[i])!=p)
- return 0;
- for(j=0;j<strlen(c[i]);j++)
- for(h=0;h<m;h++)
- if(A[h].b==c[i][j])
- A[h].a=1;
- }
- for(i=0;i<m;i++)
- if(A[i].a==0)
- return 0;
- for(i=0;i<n;i++)
- {for(j=i+1;i<=n;i++)
- {
- x=0;
- for(h=0;h<p;h++)
- if(c[i][h]==c[j][h])
- x++;
- }
- if(x>1)
- return 0;
- }
- return 1;
- }
- int main()
- {
- int n,p,m,i;
- cin>> m;
- for(i=0;i<m;i++)
- A[i].b='a'+i;
- cin>>n>>p;
- if(p_sistem(m,p,n))
- cout<<"DA";
- else
- cout<<"NU";
- return 0;
- }
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